Select The Question Mark (?) Number From The Given Responses?
Answer: (3) 19
Explanation:-
22 – 15 = 7 & 16 – 9 = 7
13 – 11 = 2 & 9 – 7 = 2
Similarly,
15 – 13 = 2 & 21 – ? = 2
– ? = 2 – 21
– ? = – 19
? = 19
Hence, the answer is (3) 19.